Allow forums to be removed without opening them.

briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListAdapter.java

@@ -13,15 +13,18 @@ import androidx.recyclerview.widget.ListAdapter;
 @NotNullByDefault
 class ForumListAdapter extends ListAdapter<ForumListItem, ForumViewHolder> {
 
-	ForumListAdapter() {
+	private final ForumListViewModel viewModel;
+
+	ForumListAdapter(ForumListViewModel viewModel) {
 		super(new ForumListCallback());
+		this.viewModel = viewModel;
 	}
 
 	@Override
 	public ForumViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
 		View v = LayoutInflater.from(parent.getContext()).inflate(
 				R.layout.list_item_forum, parent, false);
-		return new ForumViewHolder(v);
+		return new ForumViewHolder(v, viewModel);
 	}
 
 	@Override

briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListFragment.java

@@ -40,7 +40,7 @@ public class ForumListFragment extends BaseFragment implements
 	private ForumListViewModel viewModel;
 	private BriarRecyclerView list;
 	private Snackbar snackbar;
-	private final ForumListAdapter adapter = new ForumListAdapter();
+	private ForumListAdapter adapter;
 
 	@Inject
 	ViewModelProvider.Factory viewModelFactory;
@@ -54,6 +54,7 @@ public class ForumListFragment extends BaseFragment implements
 		component.inject(this);
 		viewModel = new ViewModelProvider(this, viewModelFactory)
 				.get(ForumListViewModel.class);
+		adapter = new ForumListAdapter(viewModel);
 	}
 
 	@Nullable

briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListViewModel.java

@@ -1,6 +1,7 @@
 package org.briarproject.briar.android.forum;
 
 import android.app.Application;
+import android.widget.Toast;
 
 import org.briarproject.bramble.api.contact.event.ContactRemovedEvent;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
@@ -15,6 +16,7 @@ import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.event.GroupAddedEvent;
 import org.briarproject.bramble.api.sync.event.GroupRemovedEvent;
 import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.R;
 import org.briarproject.briar.android.viewmodel.DbViewModel;
 import org.briarproject.briar.android.viewmodel.LiveResult;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
@@ -40,6 +42,7 @@ import androidx.annotation.UiThread;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
+import static android.widget.Toast.LENGTH_SHORT;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.now;
@@ -180,4 +183,17 @@ class ForumListViewModel extends DbViewModel implements EventListener {
 		return numInvitations;
 	}
 
+	void deleteForum(GroupId groupId) {
+		runOnDbThread(() -> {
+			try {
+				Forum f = forumManager.getForum(groupId);
+				forumManager.removeForum(f);
+				androidExecutor.runOnUiThread(() -> Toast
+						.makeText(getApplication(), R.string.forum_left_toast,
+								LENGTH_SHORT).show());
+			} catch (DbException e) {
+				handleException(e);
+			}
+		});
+	}
 }

briar-android/src/main/java/org/briarproject/briar/android/forum/ForumViewHolder.java

@@ -4,6 +4,8 @@ import android.content.Context;
 import android.content.Intent;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.ImageButton;
+import android.widget.PopupMenu;
 import android.widget.TextView;
 
 import org.briarproject.briar.R;
@@ -11,30 +13,40 @@ import org.briarproject.briar.android.util.UiUtils;
 import org.briarproject.briar.android.view.TextAvatarView;
 import org.briarproject.briar.api.forum.Forum;
 
+import java.util.logging.Logger;
+
 import androidx.recyclerview.widget.RecyclerView;
 
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_NAME;
 
 class ForumViewHolder extends RecyclerView.ViewHolder {
 
+	private static final Logger LOG =
+			getLogger(ForumViewHolder.class.getName());
+
+	private final ForumListViewModel viewModel;
 	private final Context ctx;
 	private final ViewGroup layout;
 	private final TextAvatarView avatar;
 	private final TextView name;
 	private final TextView postCount;
 	private final TextView date;
+	private final ImageButton menuButton;
 
-	ForumViewHolder(View v) {
+	ForumViewHolder(View v, ForumListViewModel viewModel) {
 		super(v);
+		this.viewModel = viewModel;
 		ctx = v.getContext();
 		layout = (ViewGroup) v;
 		avatar = v.findViewById(R.id.avatarView);
 		name = v.findViewById(R.id.forumNameView);
 		postCount = v.findViewById(R.id.postCountView);
 		date = v.findViewById(R.id.dateView);
+		menuButton = v.findViewById(R.id.menuButton);
 	}
 
 	void bind(ForumListItem item) {
@@ -64,6 +76,22 @@ class ForumViewHolder extends RecyclerView.ViewHolder {
 			date.setVisibility(VISIBLE);
 		}
 
+		// Open popup menu
+		menuButton.setOnClickListener(v -> {
+			LOG.info("Menu click");
+			PopupMenu pm = new PopupMenu(ctx, menuButton);
+			pm.getMenuInflater().inflate(R.menu.forum_list_item_actions,
+					pm.getMenu());
+			pm.setOnMenuItemClickListener(it -> {
+				LOG.info("Menu item click");
+				if (it.getItemId() == R.id.action_forum_delete) {
+					viewModel.deleteForum(item.getForum().getId());
+				}
+				return true;
+			});
+			pm.show();
+		});
+
 		// Open Forum on Click
 		layout.setOnClickListener(v -> {
 			Intent i = new Intent(ctx, ForumActivity.class);